class_docstr: Base for all Viz classes.
class_docstr_tok: ["Base","for","all","Viz","classes","."]
docstr: Wraps item around a list
docstr_tok: ["Wraps","item","around","a","list"]
code: def _listw(item: Any) -> list:
      """Wraps item around a list"""
      return (
          []
          if item is None
          else item
          if isinstance(item, list)
          else [item]
      )
  
file_path: tslumen/tslumen/plot/interactive/base.py
imports: from typing import Optional, Any, Type
  from collections.abc import Mapping
  from abc import ABC, abstractmethod
  from copy import deepcopy
  import inspect
label_desc: Use image node_id 3 for calling the VizBase obj's underlying member method code with example usage: obj._listw(item) and returns: unknown